What about the ones that don't?

Or what about "10 times less than..."? Do they mean "a tenth of.."? Drives DH round the bend, and now he's got me at it too.

And the ones that say "cleans up to 2 times more than...". What's wrong with "cleans twice....."?

Getting back on track(ish) these ads that claim to improve/remove "up to" (insert percentage of choice) something?

Well, anything from 1% could be considered to fall within the "up to" bracket.

And have you noticed that especially in cosmetics ads, they use figures such as 97% of women agreed. Then you look and see it was actually 97% of some random figure like 134

They just keep playing with the numbers until they find ones they like.

Slightly off piste, but we used to refer to people as a bit Dagenham, as in almost Barking.

In my childhood Harpic was advertised as the only toilet cleaner that "cleans round the bend".

After that, anyone who was slightly odd by our standards was described as being slightly Harpic (= clean round the bend)

"Repels" is a fatuously vague claim too. How do you know? There might just not be any around at the time.
I like my claims to be more assertive. Was it Domestos that used to claim "Kills 99% of all germs. Dead"??
But now I am worrying about that 1%. Does it not kill them or just not dead?